| Model | G20A1 |
| Size (HxWxD mm) | 40.2x42.9x7.5 |
| M (g) | 21.5 |
| V (cc) | 9.7 |
| Connector | IS-1 BI or UNI |
| Radiopaque ID | VG |
| Battery | |
| Type | Lithium-iodine |
| Voltage | 2.8 V |
| Average projected capacity | .92 Ah |
| Longevity | 10.4 years* |
Programmable Parameters
| Parameter Name | Range | Nominal Value |
| Pacing Modes | VVIR, VVI, VVT, VOOR, VOO, AAIR, AAI, AAT, AOOR, AOO, OVO, OAO | VVIR |
| Lower rate | 30, 35, 40…60…170, 175 ppm (exc. 65, 85) | 60 ppm |
| Upper Sensor Rate | 80, 90, 95…130…180 ppm | 130 ppm |
| A and RV Pulse Amplitudea | 0.5, 0.75, 1.0…3.5…4, 4.5, 5, 5.5, 6, 7.5 V | 3.5 V |
| A and RV Pulse Width | 0.12, 0.15, 0.21, 0.27, 0.34, 0.4, 0.46, 0.52, 0.64, 0.76, 1, 1.25, 1.5 ms | 0.4 ms |
| Atrial Sensitivity | 0.25, 0.35, 0.5, 0.7, 1, 1.4, 2, 2.8, 4 mV | 0.5 mV |
| Ventricular sensitivity | 1, 1.4, 2, 2.8, 4, 5.6, 8, 11.2 mV | 2.8 mV |
| Pacing Polarity (A and V) | Bipolar, Unipolar, Configure | |
| Sensing Polarity (A and V) | Bipolar, Unipolar, Configure | |
| Atrial Refractory Period | 180, 190, 200…250…500 ms | 250 ms |
| Atrial Blanking Period | 130, 140, 150…180…350 ms | 180 ms |
| Ventricular Refractory Period | 150, 160, 170…330…500 ms | 330 ms |
| Therapies to promote intrinsic activation | ||
Sleep
|
On, Off 30, 35, 40…50…90 ppm (exc. 65, 85) 00:00, 00:15, 00:30…22:00…23:45 00:00, 00:15, 00:30…8:00…23:45 |
Off 50 ppm 22:00 8:00 |
| Single Chamber Hysteresis | Off, 40, 50, 60 ppm | Off |
Rate Response Pacing
| Parameter Name | Range | Nominal Value |
| ADL Rate | 60, 65, 70…95…175, 180 ppm | 95 ppm |
| Rate Profile Optimization | On, Off | On |
| ADL Response | 1, 2, 3, 4, 5 | 3 |
| Exertion Response | 1, 2, 3, 4, 5 | 3 |
| Activity Threshold | Low, Medium Low, Medium High, High | Medium Low |
| Acceleration | 15 s, 30 s, 60 s | 30 s |
| Deceleration | 2.5 min, 5 min, 10 min, Exercise | Exercise |
Conducted AF Responseb
| Parameter Name | Range | Nominal Value |
| Regularize V-V during AT/AF | On, Off | Off |
| Maximum Rate (ppm) | 80, 85, 90…110…130 | 110 |
Implant Detection and Initialization
At the completion of the 30-minute Implant Detection period, Rate Profile Optimization is enabled; the appropriate pacing and sensing polarities are automatically selected by the device; Ventricular Output Management is enabled and Amplitude and Pulse Width become adaptive. Sensing Assurance™ is enabled and Sensitivity becomes adaptive.
| Implant Detection | On/Restart, Off/Complete |
| Lead Monitor (A and V) | Configure, Monitor Only, Adaptive (Auto Polarity Switch), Off |
| Parameter Name | Range | Nominal Value |
| Notify If < | 200 Ω | 200 Ω |
| Notify If > | 1000, 2000, 3000, 4000 Ω | 4000 Ω |
| Monitor Sensitivity | 2, 3, 4 … 8 … 16 | 8 |
Ventricular Output Management
| Parameter Name | Range | Nominal Value |
| Ventricular Output | ||
| Management | Off, Monitor Only, Adaptive | Adaptive |
| Amplitude Margin | 1.5x, 2x, 2.5x, 3x, 4x (times) | 2x |
| Minimum Adapted Amplitude | 0.5, 0.75…2…3.5 V | 2 |
| Capture Test Frequency | 15, 30 min; 1, 2, 4, 8, 12 hours; Day at rest; Day at…; 7 days at | Day at rest |
| Capture Test Time | 00:00, 1:00…23:00 | |
| Acute Phase Days Remaining | Off, 7, 14, 21…84, 112, 140, 168… 252 days | 112 days |
| V. Sensing During Search | Unipolar, Bipolar, Adaptive | Adaptive |
Sensing Assurance
| Parameter Name | Range | Nominal Value |
| Sensing Assurance (A and V) | On, Off | On |
Cardiac Dashboard II
Highlights significant events, AT/AF and pacing summary, threshold
and impedance trends
Ventricular pacing threshold trends
Battery longevity
Pacing summary and access to rate histogram
Atrial and ventricular lead impedance trends
Number of hours/day in atrial arrhythmia, percentage of time
Access to AT/AF diagnostics
Observations
P-wave/R-wave amplitudes and access to A and V sensitivity trends
AT/AF compass trends
Trend data compiles up to 6 months of daily clinical information in an
easy-to-interpret graphic format
Histogram reports
Heart rate histograms
Sensor indicated rate profile
Atrial and ventricular episodes
High rate episodes
Atrial arrhythmia durations
Multiple EGM episodes
AT/AF duration
Clinician selected diagnostics
Custom rate trend
Ventricular Output Management detail
High rate detail
Patient data stored in device
Patient identification
Leads implanted
Device implanted
Clinician’s stored notes
Data management
Automatic printing of initial interrogation report
Full page printing
Save-to-Disk capacity for electronic file management
| Telemetry features | |
| Transtelephonic monitor | On, Off |
| Extended telemetry | On, Off |
| Extended marker | Standard, Therapy Trace |
Key parameter history
Initial interrogation report
Strength duration threshold test
Ventricular threshold test
Marker Channel™
Threshold margin test
Exercise test
EP studies
Magnet test
Underlying rhythm test
Sensing test
Temporary test
Magnet mode operation
| BOS | ERI/RRT | |
| Single chamber atrial mode | AOO 85 ppm | 65 |
| Single chamber ventricular mode | VOO 85 ppm | 65 |
| ERI-RRT | Initiation Date |
Recommended Replacement Time (RRT/ERI) |
|
| Replacement message on programmer (Cardiac Dashboard II) | |
| Battery/lead information | Replacement message and displayed battery voltage on programmer |
| RRT/ERI initiation date | Displayed on programmer |
a Tolerance for amplitudes from 0,5V through 6.0V is ± 10%, and for 7,5V is -20/+0%. Tolerances are based on 37°C and a 500± load. Amplitude is determined 200 μs after the leading edge of the pace.
b Conducted AF Response is functional during WIR modes.
*SSIR or SSI, 60 ppm, 100% pacing, 2.0V, 0,4 ms pulse width, 1000Ω pacing impedance.